Answer:
The expression "not really reliable" shows that Dominic was unsafe, inappropriate, and not someone to trust in any way.
Step-by-step explanation:
The suffix -able is of Latin origin and refers to something that is appropriate, possible, or capable of something. In this case, we can use this as a context clue to understand the expression "not really reliable," which means that something wasn't appropriate, wasn't able to do something right, wasn't able to promote confidence in any activity.
Context clue is the ability of a text to reveal the meaning of words or expressions through the context that the text presents, if analyzed as the set of all used words.